yup. If it is waxed really well, the protection from bird poo etching is a lot better than bare clear coat. Buttery should be pretty slick.
Regarding the clay bar, I would only do that quarterly, even if it is outside, and only if it does not pass the 'baggie over your hand' test. Clay it right before you do any other surface correction and or (super machine wax/buttery wax/americana wax).
After it's all polished and waxed up, sometimes the bird poo (if near/on curved surface) may even ricochet off - you will see an odd colored 'film' on the paint, and the poo will will be on the ground. The film will wipe off easily. THAT's a real benefit to having a well waxed finish, and I agree with CRQuarto -a smooth, polished, and slick finish also helps the ease of ongoing maintenance. Once you get it nice, it's easier to keep it that way. Go for it.
If you are curious about the 'baggie' test, check out the Adam's videos on claybar and polishing.